nav{
	background-color: black;
	color: white;
}
section{
	width: 100%;
	height: 100px;
	display: flex;
	justify-content: center;
	align-items: center;
	background-color: black;
	opacity: 0.5;
}
.miaoshu{
	text-align: center;
	font-size: 40px;
	color: white;
	line-height: 100px;
}
.col-md-6{
	/*border: 1px solid grey;*/
	margin-top: 50px;
	box-shadow: 10px 0 10px grey;
}
.col-md-6 img{
	margin-left: 125px;
}
.col-md-4{
	font-size: 30px;
	margin-top: 50px;
	margin-left: 10px;
	box-shadow: 10px 0 10px grey;
}
.col-md-4 img{
	width: 350px;
	height: 250px;
	margin-top: 20px;
}

